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Basis of Presentation and Accounting Policies Basis of Presentation and Accounting Policies (Details) - Subsequent Event [Member] € in Millions, $ in Millions | 1 Months Ended | 6 Months Ended
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Jul. 31, 2015 USD ($) | Jul. 31, 2015 EUR (€) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 EUR (€)
French Payroll Tax Credits [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Proceeds from sale | $ 130.0 | € 120.1 |  |
Forecast [Member] | 7S [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Purchase price |  |  | $ 144.9 | € 136.5

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